Artwork must be "camera ready"; i.e. must be useable as is. Any adjustment of layout, etc. will incur this charge.
Artwork for printing should be in vector format such as Adobe Illustrator or Corel Draw but these may be converted to pdf for simplicity.
If you have any special font requirements, you need to save your artwork in "Outline" or "Curves" mode-your graphic artist will know what this is.